fix(demo): correct source URL

Author: javier-godoy

src/test/java/com/flowingcode/vaadin/addons/demo/Demo.java

@@ -29,7 +29,7 @@ public class Demo extends TabbedDemo {
 
   public Demo() {
     final String sourceCodeUrl =
-        "https://github.com/FlowingCode/CommonsDemo/blob/master/src/test/java/com/flowingcode/vaadin/addons/demo/impl/Demo.java";
+        "https://github.com/FlowingCode/CommonsDemo/blob/master/src/test/java/com/flowingcode/vaadin/addons/demo/Demo.java";
     VerticalLayout vl = new VerticalLayout();
     VerticalLayout vl2 = new VerticalLayout();
     VerticalLayout vl3 = new VerticalLayout();

src/test/java/com/flowingcode/vaadin/addons/demo/SampleDemo.java

@@ -25,10 +25,11 @@
 
 @PageTitle("Demo 4")
 @DemoSource(
-    "https://github.com/FlowingCode/CommonsDemo/blob/master/src/test/java/com/flowingcode/vaadin/addons/demo/impl/SampleDemo.java")
+"https://github.com/FlowingCode/CommonsDemo/blob/master/src/test/java/com/flowingcode/vaadin/addons/demo/SampleDemo.java")
 public class SampleDemo extends Div {
 
   public SampleDemo() {
     add(new Span("Demo component with annotations"));
   }
+
 }